The book has a lot of scientific component from various fields: geology, paleontology, botany, zoology, physics. But everything is very accessible and understandable. The plot focuses on a exploratory journey to the center of the earth through a volcano crater. The starting button for him was an encrypted message on half-decayed parchment. By happy coincidence, it fell into the hands of the famous and very gambling scientist. How could he remain indifferent? Of course not such people do not miss the opportunity to discover something new and are not afraid of dangerous adventures.